Kennametal 7081747 Extra Length Drill Bit 5.50mm Carbide

Product Description

The KENNAMETAL 7081747 is a solid carbide extra length drill bit engineered for deep-hole drilling in demanding production and machining environments. Part of the HPR series, it features a dual coating of AlCrN and TiAlN for heat resistance and extended tool life at elevated cutting speeds. At 5.50mm in diameter with a 173mm overall length and a 15xD flute-to-diameter ratio, it is built to reach depths that standard-length drills cannot achieve. The through-coolant design delivers cutting fluid directly to the tip, flushing chips and reducing heat at the cutting zone. This drill is installed and operated by machinists and CNC tooling specialists in metalworking facilities.

This drill is suited for deep-hole applications in aerospace, automotive, die and mold, and general precision machining. Its 130mm flute length and 117mm maximum drilling depth make it appropriate for production runs requiring consistent, accurate holes in steel, stainless, cast iron, and similar difficult-to-machine alloys. The two-flute spiral geometry and 135-degree drill point angle promote chip evacuation and accurate entry. The 6.0mm shank diameter provides rigid toolholder engagement in standard collet chucks and hydraulic holders.

Key Features

• Solid carbide construction delivers rigidity and wear resistance in hard and abrasive workpiece materials
• AlCrN and TiAlN dual coating provides high-temperature resistance and reduces built-up edge
• Through-coolant capability directs fluid to the cutting edge for chip evacuation and thermal control
• 15xD flute-to-diameter ratio enables drilling to 117mm maximum depth
• 135-degree chisel point angle supports self-centering entry and accurate hole location
• Two-flute spiral geometry optimized for chip flow in deep-hole applications

Compatibility

Designed as an OEM-style replacement or direct substitute for solid carbide extra length drill bits in the HPR series. Suitable for use in CNC machining centers and drill presses with toolholders accepting a 6.0mm shank diameter.

Installation Notes

Installation and operation of this drill bit should be performed by qualified machinists or CNC tooling technicians. Ensure the machine spindle is fully stopped and the tool changer or spindle is locked out before inserting or removing the drill from its holder. Confirm the collet or chuck bore matches the 6.0mm shank diameter and that runout is within acceptable tolerance before beginning a cut. Enable through-coolant flow prior to contact with the workpiece to prevent thermal shock to the carbide substrate.